Current Electricity · JEE Main previous year questions

2022 54 questions

1. Q362022 · 24 Jun 2022 · Shift 2

   What will be the most suitable combination of three resistors $\mathrm{A}=2\Omega$, $\mathrm{B}=4\Omega$, $\mathrm{C}=6\Omega$ so that $\left(\frac{22}{3}\right)\Omega$ is equivalent resistance of combination?

   1. A.Parallel combination of A and C connected in series with B.
   2. B.Parallel combination of A and B connected in series with C.
   3. C.Series combination of A and C connected in parallel with B.
   4. D.Series combination of B and C connected in parallel with A.
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   Answer: B

2. Q412022 · 24 Jun 2022 · Shift 2

   An object of mass $5\mathrm{kg}$ is thrown vertically upwards from the ground. The air resistance produces a constant retarding force of $10\mathrm{N}$ throughout the motion. The ratio of time of ascent to the time of descent will be equal to : [Use $\mathrm{g}=10\mathrm{m}{\mathrm{s}}^{-2}$].

   1. A.$1:1$
   2. B.$\sqrt{2}:\sqrt{3}$
   3. C.$\sqrt{3}:\sqrt{2}$
   4. D.$2:3$
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   Answer: B

3. Q532022 · 24 Jun 2022 · Shift 2· Numerical answer
   
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   Answer: 5

4. Q582022 · 24 Jun 2022 · Shift 2· Numerical answer

   A potentiometer wire of length $10\mathrm{m}$ and resistance $20\Omega$ is connected in series with a $25\mathrm{V}$ battery and an external resistance $30\Omega$. A cell of emf E in secondary circuit is balanced by $250\mathrm{cm}$ long potentiometer wire. The value of E (in volt) is $\frac{x}{10}$. The value of x is ____.

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   Answer: 25